Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354..735l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 10, 1990, p. 735-744.
Astronomy and Astrophysics
Astrophysics
30
Microwave Emission, Solar Electrons, Solar Flares, Solar X-Rays, Electron Distribution, Solar Corona, Solar Magnetic Field, Synchrotron Radiation, Thermal Emission, Trapped Particles
Scientific paper
The delay of microwaves relative to hard X-rays from solar flares is investigated. For short-time scale delays, it was found that for reasonable thick-target model parameters and for injected electron distributions which are separable in time, energy, pitch angle, and position, the observed delay cannot be explained by magnetic trapping of electrons in the corona. It can be accounted for if higher energy microwave producing electrons are accelerated later than lower energy hard X-ray producing electrons. For larger time-scale delays, it is found that the flux during the rising phase of the flares can be explained well in terms of the thick-target model, but during the decay phase this model predicts too little microwave flux. A number of possibilities for this excess microwave flux are explored including spectral hardening, magnetic trapping, and thermal synchrotron and free-free emission.
Lu Edward T.
Petrosian Vahe
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